From a dealership tech with many years of experience, I found out that the crank/aka case learn is an optimization of the pcm knowing the crank position. Based on cam and the crank 3x and 18x signals it should know pretty well. However I have also had a couple of cases where the car fired, ran horrible like a sensor was wacked or something. Upon finding nothing else I case learned and the car ran great from then on. Typically though, you'll fire them up and they run fantastic. I do quite a few crank sensors and have the tool to learn them. Typically though..I don't bother.
